Windows 10: how to change from uefi to LEGACY BIOS on imac 2011 with windows 10?

I have windows 10 on my mid 2011 imac 21.5" computer. Every driver is working perfectly except for the sound drivers. I am told that the reason for this is because i downloaded windows through a efiboot, instead of a bios boot. I was wondering how i can change my boot from uefi to legacy bios on a gpt partition? It would be preferable to to not have to install and reinstall windows 10 but if there really is no other way I guess thats whats going to have to happen. i do not have a windows 10 disc as i got it through a bootable usb with the windows 10 iso on it. thank you for any and all help!

:)

 

Convert Mid-2011 iMac from UEFI to Legacy BIOS.

Hello!

I have a mid-2011 iMac with which I am dual booting windows 10 and macOS high sierra. Since it is not compatible with bootcamp, I made a bootable usb drive and used that instead. This all worked very well except for that Windows does not recognize my sound
card. I have tried to fix this for hours and hours, but eventually read that the iMac must be in legacy BIOS for this to work. Looking at some answers on the internet, every way to change the computer from UEFI to Legacy BIOS I found has confused me and would
risk my hard drive getting wiped.

I would greatly appreciate it if someone had a relatively simple way to do this and could lay it out very clearly for me as I am not that knowledgeable with how all of these boot systems work.

I cannot put my Mac partition at risk but am willing to delete my Windows one and install Windows again if necessary.

Thank you so much for helping!

P.S. I am not sure whether I should have posted this on the Apple or Microsoft forums but hopefully this will work.

 

Problem Regarding Bios Change from UEFI to Legacy

I have hp pavilion p045tx with windows 10 pro. I recently install Ubuntu with windows 10 so for that I convert my bios setting from UEFI to Legacy mode for install third party software like wireless Driver and all in Ubuntu.
But after every restart the bios setting change to default and that is to UEFI mode and that will cause an problem of no OS detect. Every time I have to go to bios setting and enable the legacy mode to start my OS. Can anyone suggest me what to do in this
case.

 

Legacy to UEFI

I'm debating moving to UEFI form my now legacy BIOS (Award Software Int.) the mother board is a GA-Z68XP-UD3 rev1.0 on the the following link it shows a UEFI BIOS U1J )UEFI BIOS)

GA-Z68XP-UD3 (rev. 1.0) | Motherboard - GIGABYTE Global

Currently I'm running the legacy F10 BIOS. Does installing the UEFI BIOS automatically take care of everything to get to the UEFI BIOS? Installing the UEFI BIOS following the instructions using the Q-flash method GIGABYTE How to Reflash Motherboard BIOS

What's steps do I take and in what order?

Much appreciated